<template>
  <a-spin :loading="loading" style="width: 100%">
    <a-card
      class="general-card"
      :header-style="{ paddingBottom: 0 }"
      :body-style="{ paddingTop: '20px'}"
      title="会员"
    >
      <template #extra>
        <a-link>查看更多</a-link>
      </template>
      <Chart height="289px" :option="chartOption" />
    </a-card>
  </a-spin>
</template>

<script setup>
  import { ref, onMounted } from 'vue';
  import { graphic } from 'echarts';

  import useChartOption from '@/hooks/chart-option';
  import { apiMember } from '@/api/dashboard';

  const loading = ref(true);
  const xAxis = ref([]);
  const chartsData = ref([]);

  function graphicFactory(side) {
    return {
      type: 'text',
      bottom: '8',
      ...side,
      style: {
        text: '',
        textAlign: 'center',
        fill: '#4E5969',
        fontSize: 12,
      },
    };
  }
  const graphicElements = ref([
    graphicFactory({ left: '2.6%' }),
    graphicFactory({ right: 0 }),
  ]);

  const { chartOption } = useChartOption(() => {
    return {
      grid: {
        left: '4%',
        right: '0',
        top: '10',
        bottom: '30',
      },
      xAxis: {
        type: 'category',
        offset: 2,
        data: xAxis.value,
        boundaryGap: false,
        axisLabel: {
          color: '#4E5969',
          formatter(value, index) {
            if (index === 0) {
              return '';
            }
            if (index === xAxis.value.length - 1) {
              return '';
            }
            return `${value}`;
          },
        },
        axisLine: {
          show: false,
        },
        axisTick: {
          show: false,
        },
        splitLine: {
          show: true,
          interval: (index) => {
            if (index === 0) {
              return false;
            }
            if (index === xAxis.value.length - 1) {
              return false;
            }
            return true;
          },
          lineStyle: {
            color: '#E5E8EF',
          },
        },
        axisPointer: {
          show: true,
          lineStyle: {
            color: '#23ADFF',
            width: 2,
          },
        },
      },
      yAxis: {
        type: 'value',
        axisLine: {
          show: false,
        },
        axisLabel: {
          formatter(value, index) {
            return value;
          },
        },
        splitLine: {
          show: true,
          lineStyle: {
            type: 'dashed',
            color: '#E5E8EF',
          },
        },
      },
      tooltip: {
        trigger: 'axis',
        formatter(params) {
          const [firstElement] = params;
          return `<div>
            <p class="tooltip-title">${firstElement.axisValueLabel}</p>
            <div class="content-panel">
              <span>总会员</span>
              <span class="tooltip-value">${(Number(firstElement.value)).toLocaleString()}</span>
            </div>
          </div>`;
        },
        className: 'echarts-tooltip-diy',
      },
      graphic: {
        elements: graphicElements.value,
      },
      series: [
        {
          data: chartsData.value,
          type: 'line',
          smooth: true,
          // symbol: 'circle',
          symbolSize: 12,
          emphasis: {
            focus: 'series',
            itemStyle: {
              borderWidth: 2,
            },
          },
          lineStyle: {
            width: 3,
            color: new graphic.LinearGradient(0, 0, 1, 0, [
              {
                offset: 0,
                color: 'rgba(30, 231, 255, 1)',
              },
              {
                offset: 0.5,
                color: 'rgba(36, 154, 255, 1)',
              },
              {
                offset: 1,
                color: 'rgba(111, 66, 251, 1)',
              },
            ]),
          },
          showSymbol: false,
          areaStyle: {
            opacity: 0.8,
            color: new graphic.LinearGradient(0, 0, 0, 1, [
              {
                offset: 0,
                color: 'rgba(17, 126, 255, 0.16)',
              },
              {
                offset: 1,
                color: 'rgba(17, 128, 255, 0)',
              },
            ]),
          },
        },
      ],
    };
  });

  const fetchData = async () => {
    loading.value = true;
    try {
      const { data: chartData } = await apiMember();
      xAxis.value = chartData.days;
      chartsData.value = chartData.totals;

      graphicElements.value[0].style.text = chartData.days[0];
      graphicElements.value[1].style.text = chartData.days[chartData.days.length - 1];
    } catch (err) {
      // you can report use errorHandler or other
    } finally {
      loading.value = false;
    }
  };

  onMounted(async () => {
    await fetchData();
  });
</script>

<style scoped lang="less"></style>
